I do the exact same thing. I'm only on my 2nd cycle of TTC and am freaking out over every little cramp and pinch. I have no reason to believe I cannot get preggers, I am healthy, always had regular periods, I am ovulating, I eat right, take vitamins, am thin, all the stuff you want to be when trying to get pregnant. And yet, the worry sets in.
These forums are so helpful in just having a person hear you out and support you. But, there are also so many people here who cannot conceive and it gets a little overwhelming when you read about it. Continue to be positive (I know, we all hate when people say that) but seriously, think future ahead. I'm not telling myself, "You have to get a BFP this month" I'm just giving myself until January before I get totally worried. That way, it takes the pressure off.